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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Apr. 04, 2020 | Mar. 30, 2019
Income Taxes |  |
Provision (benefit) for income taxes | $ (587) | $ (2,480)
Effective income tax rate (as a percent) | (35.40%) | (85.00%)
Gross unrecognized tax benefits | $ 3,000 |
Gross unrecognized tax benefits which would affect the effective tax rate if recognized | 2,100 |
Norwegian |  |
Income Taxes |  |
Additional income tax expense | 13,500 |
Norwegian | 2013 | Under appeal |  |
Income Taxes |  |
Additional income tax expense | $ 141,300 |

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